Overview
The ZF 4657.183.112 is a critical OEM genuine component engineered specifically for the WG 190 Series transmission family. This part functions as a precision-machined internal guide or sealing element, positioned within the main valve body or clutch housing assembly to regulate hydraulic fluid flow and maintain proper pressure distribution. The SKU 4657.183.112 ensures exact fitment and material compatibility with ZF’s original design tolerances, reducing the risk of premature wear in high-torque applications. When installed alongside the TRANSMISSION HOUSING (4657101034), it forms a sealed boundary that prevents cross-contamination between lubrication circuits.
Symptoms of Failure
- Intermittent gear slipping under load: A worn 4657.183.112 can cause pressure loss in the clutch pack, leading to hesitation or slippage during acceleration, especially when towing or climbing grades.
- Hydraulic fluid seepage near the bell housing: Deterioration of the sealing surface results in visible oil leaks around the transmission case, often mistaken for a main seal failure.
- Erratic shift timing or harsh engagements: Debris or deformation of this part disrupts pilot pressure signals, causing delayed upshifts or jarring downshifts in the WG190.
- Elevated operating temperatures: Restricted fluid passages from a failing component increase internal friction, triggering thermal warnings on the dashboard.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4657.183.112 |
| Material | Hardened alloy steel with corrosion-resistant coating |
| Weight | 0.42 kg (0.93 lbs) |
| Dimensions (L x W x H) | 68 mm x 38 mm x 22 mm |
| OEM Reference | ZF 4657.183.112 (Genuine) |
| Surface Finish | Ground and polished to Ra 0.4 µm |
Compatibility
This part is primarily designed for the ZF WG 190 Series, but it also fits select models in the WG180 and WG200 families due to shared hydraulic architecture. It is directly compatible with the HOUS.FRONT SECT (4657201027) and the HOUSING REAR PART (4657201012), which together form the structural envelope of the transmission. The CYLINDRICAL PIN (0631306792) is used during installation to align the 4657.183.112 with the valve body bore. Always verify your transmission serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101034 | TRANSMISSION HOUSING | Main structural casing that encloses gear sets and hydraulic circuits |
| 4657201027 | HOUS.FRONT SECT | Front section housing that supports the torque converter and pump |
| 4657201012 | HOUSING REAR PART | Rear housing that contains the output shaft and speed sensors |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for precise positioning of valve body components |
| 0636100801 | CAP SCREW | Fastener for securing the housing sections together |
| 4656301148 | FIXING PLATE | Retaining plate that locks the valve body in position |
| 4657301032 | SCREEN SHEET | Fine mesh filter for primary hydraulic fluid filtration |
| 4657301033 | SCREEN SHEET | Secondary filter screen for high-pressure circuits |
| 0636100803 | CAP SCREW | Bolt for attaching the oil pan or cover plate |
| 4681301040 | OIL FEED.HOUSG. | Housing that directs pressurized oil to the clutch packs |
Frequently Asked Questions
Q: Can the 4657.183.112 be replaced without removing the entire transmission?
A: In most WG190 applications, this component is accessible after draining the fluid and removing the valve body cover. However, clearance may require dropping the transmission crossmember on certain vehicle chassis.
Q: How does this part interact with the CYLINDRICAL PIN (0631306792)?
A: The cylindrical pin acts as a locating dowel that centers the 4657.183.112 within its bore. Without proper pin alignment, the sealing surfaces can become misaligned, leading to premature failure.
Q: Is the 4657.183.112 interchangeable with aftermarket versions?
A: Only the OEM genuine part matches the exact hardness and surface finish specifications. Aftermarket copies often lack the corrosion-resistant coating, resulting in reduced service life in wet clutch environments.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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